Elena sews sequins on a skirt for the dance recital. she sews 100 sequins end to end along the length of the skirt. The skirt is 50 cm long. What's the length of one sequin?

Find the solution of system of equation y= x-4 y=4x+2

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?

Aresearch study is done to find the average age of all u.s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample